Subkingdom Protozoa
The diverse organisms in the subkingdom Protozoa are unicellular, eukaryotic, and are defined as single-celled organisms with animal-like behaviors, such as motility and predation. Protozoa are the animal counterpart to the other more plant-like subkingdom within Protista, Protophyta. The terms protozoa and protozoans are also used informally to designate single-celled, non-photosynthetic protists, such as ciliates, amoebae and flagellates.